Delta type resonant cavity/integrating sphere combination reinforcing cavity capable of improving sensitivity of gas Raman detection

Abstract

The invention relates to a delta type resonant cavity/integrating sphere combination reinforcing cavity capable of improving the sensitivity of gas Raman detection. The delta type resonant cavity/integrating sphere combination reinforcing cavity comprises three endoscopes (M1, M2 and M3) with high reflectivity, a gold-plated integrating sphere, inverse reflecting mirror (M4) with high reflectivityand a sealing chamber, wherein the three endoscopes (M1, M2 and M3) with the high reflectivity are inlaid in three holes corresponding to the gold-plated integrating sphere, the inverse reflecting mirror (M4) with the high reflectivity is arranged outside the gold-plated integrating sphere and in rear of the endoscope (M3), and the inverse reflecting mirror (M4) is arranged in the sealing chamber. The delta type resonant cavity/integrating sphere combination reinforcing cavity capable of improving the sensitivity of the gas Raman detection has the advantages that for the problems that an existing detection device for characteristic gases in a change-over state is low in detection accuracy and cannot measure and distinguish multiple characteristic gases simultaneously, the technical bottleneck that the minimum gas detection concentration of a Raman spectrum cannot meet the requirements is broken through, and the accuracy and sensitivity of the detection of the characteristic gases in the change-over state are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of detection devices for state characteristic gas of electric equipment, and in particular relates to a △-shaped resonant cavity / integrating sphere combined enhancement cavity for improving Raman intensity of gas. Background technique [0002] As the key equipment in the DC transmission system, the converter converter will not only damage the expensive electrical equipment, but also lead to the paralysis of the power grid, causing inestimable losses to the daily life of the people and the national economy. The running converter oil-paper insulation system will decompose under the action of various factors such as electricity and heat, and produce various gases (H 2 、CH 4 、C 2 h 2 、C 2 h 4 、C 2 h 6 , CO, CO 2 , O 2 etc.), and dissolved in insulating oil. Accurate detection of 8 kinds of trace fault characteristic gases in oil is of great significance to ensure the safe and reliable operation of larg...

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Problems solved by technology

[0004] In order to solve the technical problems such as gas cross-interference, easy aging, and poor stability existing in current rheological state characteristic gas detection devices, the present invention proposes an optical feedback frequency-locked △-type resonant cavity / gold-plated integrating sphere combined enhanced Raman spectrum detection method, A micro-gas optical feedback frequency-locked △-type resonant cavity / integrating cavity combined enhanced Raman spectroscopy detection device was designed to realize the trace detection of gas Raman spectroscopy in complex states of converter rheology

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